Wood-turning machine



April 24, 1928.

C. L. MATTISON WOOD TURNING MACHINE Fi1ed'111ay 11, 1925 2 Sheets-Sheetl April 24, 1928.

C. L. MATTISON WOOD TURNING MACHINE Filed May 11, 1925 2 Sheets-Sheet 2NN ,NNN

Patented Apr. 24,

omar. l LAWRENGEE Harrison,

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woon-Tonarm@ Immun; l

Application. inea. nay, ,1"1,

The method in common use for support.- ing the stick to beturnedconsistsin mountf ingl the p l cup center', thestick being caused, to revolve bymeans of power applied'lto., the spur center. lVhen sosupportedrrotation of the stickl at high speed. produces torsionalstresses 4which setup vibration or chatter-7 ing, thus producing chattermarks Awhich cannot be. removed even I v n y oven, the twisting stressesresulting from the fact that the stick is driven A n only may become sogreat that` a,. slender piece of. workl may break. l 1

rllhe object of my invention is tolprovide, y y n l wardandr awayfromthelcutter.

in ay wood. turning machine, means whereby both@ endsof the stickareposit-ively'driven.. ini synchronism, toI the` endthatga Thigh rate fof. production. may bek attained iwithout 'sacri-H ficingquality.

In the accompanying drawings, l. haveVA illustratedk a, preferredembodiment of' my invention, but it' shouldbeunderstood that it islnotintendedvto limit the invention to the particular construction v andarrangement shown, it, being, contemplated that various changes may bemade by those skilled in the art without departing from the 'spirit'`andy scopefof the invention: as expressed in the appended'cl'aim. Figurel is a fragmentary front eleva- Ytional view partially in section, of awood turning machine embodying my invention. Fig. 2 is a fragmentaryelevational view of one end of the machine, the driving shaft beingshown in Section.v Y f Fig. 3 is a fragmentary elevational view lookingfrom the opposite end of the Ama'- chine.V

f Fig. 4t is a fragmentaryV sectional view yillustrating a detail ofconstructionon an enlarged scale, the view being takenl approximately inthe plane of line 4-4 of Fig. l.

The machine hereinv shown `for purposes of illustration comprises a mainframe or base 7 on which is mounted for rotation a cutter spindle 8 uponwhich is supported a` lcutter 9 shown diagrammatically in Fig. 1. Thework is supported upon a swinging ta.- ble l0 mounted for movementtoward. and away from the cutter. The table 10 is carried upon the upperend of anupright frame 11 having its lower end pivotally stick betweenaI spur' center vand aV by sanding. -More.l

from one end l supportedvin,,suitable bearings'f12 at the lower forwardside-of. the base.- f Means isVL providedl for 'swinging the l table.toward; and. away "fromy the frame: which iny the' presentinstanceconsists. off a rock shaft 50 supported a substantialdistance. ,fors`wardly of tlief frame' Kupon forwardly eX- tendingbracloets-v l securedto the` frame so as to be adj ustable forwardly .andrearwardly relativethereto;` A' pairvofflever, arms 52 faston. the rockshaft 50, arepivotally. coul-pv nectedf by linksf wi'thfjthe. yframell, and y one endof the-rock shaft has an 'operating handle yor lever 54 whereby theshaftfmay. be rockedy and;y the-,table thereby, moved tol Upon the tablearesupported a headstook:

l3, and a` taiilstockw 1.4, lad'aptedf for adjust? ment` in a well.knownwayflj The headstock.l comprisesa spindle-.l5 at' the forward; endof whichis suitablysecuredj a'. spur center -16 fand near therear-endet. which' isse cured" a YwormV wheel' lflenclosed within asuitable 'housingkl8ywhich]also encloses. a 'worm 19 on the tippen end'of an uprfight shaft'20; The `worm ,'wheel-and worm are arranged' tomesh 'for' thepurpose of' trans,- mitting vmotion from the shaftr 20/toythe lspindlefl, thev shaft20 being operatively connectedat its'lowerendwitl a drive shaft 21 (Fig. 2) through the medium f bevel` gearing22. A pairof universal couplings 23 and 24 are provided in the shaft 20.

The tailstock l4`comprises a spindle 25 carrying at its inner end a spurcenter 26. Herein the spindle 25 is shown as being mounted in thetailstook bearing through the medium of'asleeve 2.9v which is arrangedto be reciprocated to move theJr spurcenter 26 toward and away from thecenter 16`by the yoperation of a lever l30 having a rack and pinionconnection 28 with the sleeve.

In` order that both centersl and 26 may be driven in synchronism '1provide an op.-

erative yconnection between the spindles 15 and 25 :comprising ashaftlVvhaving one end mounted. in the headstock for rota-V tionalbutnon-longitudinal movement, and

its other end slidableit'hrough a suitable A bearing 32 inV thetailstock. On theY headstock spindle is a driving pinion 33 meshing withan intermediate or idler gear'll which latter'infturn meshes withapinion 35 fast on' the shaft 3K1. The, intermediate gear 34 issupported by a bracket 36 on the head' with the driving gear 33 and thepinion 35 so as to ensure that no lost motion or play shall occur in thetransmission, of power Ytrom the spindle 15 to theshaft 31.

VVA similar arrangement is provided in transmitting power from "theshaft 31 to the tailstock spindle 25. Thus the tailstock spindle hasfixed thereon a driven pinion 40 meshing with an intermediate gear 41,While the latter meshes with a driving pinion 42 `splined on the shaft3l so as to be slidable with the tailstock relative to the shaft '31.The intern'iediate gear 41 is mounted on a bracket 43 which like thebracket 36 is apertured at'45 to receive astud 44 carrying theintermediate gear. vThe hole 45v in the bracket is somewhat larger thanthe diam` eter of the stud, as in the case of theheadstock, so that heretoo any looseness or backlash between the gears maybe eliminated.

VInasmuch Iasthe spindle 25 in the tailstock is mounted 'forlongitudinal movement therein the intermediate gear 41`is made ofsubstantial Width so that the driven pinion 40 on thefspindle may moveaxially relative to the gear 4l in the movements of thc spindle Whileremaining in mesh with the gear 41.

It willl be understood that the gears for transmitting motion from theheadstock spindle to the shaft 31 and the gears for transmitting motionfrom the shaft 31 to the tailstock spindle 25 are similarly proportionedso that both spindles are driven at the same speed. The spur centers 16and 26, therefore, positively engaging both ends of the stick, drive thesame in unison, thus avoiding any torsional stress in the stick andconsequently eliminating eiectually any Vchattering or' the stickrelative to the cutter 9. Inasmuch as both ends of the stick vare drivenby spur centers, it is possible to turn the stick clear up to the ends,thereby obviating the necessity forany subsequent operation to cut olifthe unturned portlon and also avoiding waste ofvmaterial.

It is essential to the successful driving of opposite ends of the stickthat all looseness in the driving connections be eliminated, and themeans which I have provided for mounting the intermediate gears 1s onemethod of eifectually accomplishing this result.

I claim as my invention:

A wood turning machine comprising, in combination, a base having` a.cutter mounted thereon, a table having a pair of Work-supporting anddriving spindles mounted in` spaced relation, a spindle drive shaft onthe table parallel to said spindles and gear trains connecting oppositeends ofthe said shaft with lthe respective spindles toydrive them insynchronism, said gear trains each con'lprisingan intermediate gearadjustable relative to the adjacent gears of the train to prevent backlash.

In `testimon whereof I have hereunto affixed my signature,

i CARL LAWRENCE MATTrsoN. l'

